What does the strcmp(str1, str2); function return?
true (1) if str1 and str2 are the same, false (0) if str1 and str2 are not the same
true (1) if str1 and str2 are the same, NULL if str1 and str2 are not the same
0 if str1 and str2 are the same, a negative number if str1 is less than str2, a positive number if str1 is greater than str2
0 if str1 and str2 are the same, a negative number if str2 is less than str1, a positive number if str2 is greater than str1